ἀντιστοιχία
From LSJ
ἑτέρως ἠδύνατο βέλτιον ἢ ὡς νῦν ἔχει κατεσκευάσθαι → otherwise they could have been constructed better than they are now (Galen, On the use of parts of the body 4.143.1 Kühn)
English (LSJ)
ἡ,
A standing opposite in pairs, τῶν ποδῶν Arist.Pr.894a19; πραγμάτων Plu.2.474a. II of letters, correspondence, of the relation of tenuis, media, and aspirate to each other, Ascl.Myrl. ap. Ath.11.501b.